Han Zhi Yuan's answer to Venkatraman Shobha's Primary 6 Maths Measurement Singapore question.
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A pen costs $1.60 and a file costs $0.80. Siti spends $76.80 and she bought 10 times more pens than files.
Let x be the number of pens bought. Then the number of files bought is 10x.
We have $1.60x + $0.80(10x) = $76.80
=> $1.60x + $8x = $76.80
=> $9.60x = $76.80
=> x = 8
Hence, Siri bought 8 pens and 80 files altogether.
Let x be the number of pens bought. Then the number of files bought is 10x.
We have $1.60x + $0.80(10x) = $76.80
=> $1.60x + $8x = $76.80
=> $9.60x = $76.80
=> x = 8
Hence, Siri bought 8 pens and 80 files altogether.
Date Posted:
4 years ago
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